Originally Posted by
Jhieminga
One tip that I was given long ago was to leave the carb heat on for a minute or two (or even longer) during the runup so that the carburettor body would be warmer. The idea was that no ice would then be able to form during the subsequent minutes of the take off. I can't claim the idea or confirm that it works... any thoughts on this?
Carburators are (were) made of pot metal so very conducive to temp changes.
Start with a hot carburetor body and within seconds after applying power you’d have a cold carb again. I would put that one to bed.
Carb heat associated rich cut? Definitely.
I’ve had two engine stoppages as a result of a too agressive application of power with carb heat on.
After that I started teaching the 3-second rule, 1-2-3 count from idle to full power or back to idle.
Carb heat OFF 1-2-3
Carb heat ON 1-2-3